flowmaster single series vs ebay knock offs

I'm getting rid of the 2 chamber flowmasters and looking to get flowmaster single series but for 1/4 the price you can get ebay knock offs. Was wondering if anybody has ran them and do they sound alike? No I don't want slp cause everybody around here is getting them and its hard to find the loudmouth 1's anymore.
 
Just remember, you get what you pay for. When your Korean mufflers are rusted out next year you'll be wishing you spent a few more dollars on something American made.